The TfL has promised that the Tube will have 4G coverage by mid-2020.
from gizmodo http://www.gizmodo.co.uk/2019/07/london-underground-will-offer-full-4g-coverage-by-next-year/
from gizmodo http://www.gizmodo.co.uk/2019/07/london-underground-will-offer-full-4g-coverage-by-next-year/
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